Method of and means for handling matter



July' 16, 1929.

J. E. BOYNTON IETHUD OF AND MEANS FOR HANDLTNG MATTER Filed May 8, 1924 4 Sheets-Sheet l July 16 1929. J. E. BoYNToN ETHOD OF AND MEANS FOR HANDLING MATTER 4 Sheets-Sheet 2 Filed May 8, 1924 III Evenr/ 71225276 QzzBgyzz on lilly 15, 1929 J. E. BoYNToN 1.720.759

` ETHOD 0F AND MEANS FOR HANDLTNG MATTER Filed May 8, 1924 4 Sheets-Sheet. 3

' l', 47' J/mEdwnWm-z July 16 15929- l J. E. BoYNToN 1,720,759

imrnob or' AND MEANS FOR HANDLTNG MATTER Filed May 8, 1924 4 Sheets-Sheet 4 Patented July 16, 1929;

UNiTED vs'rATiis PATENT OFFICE.

JOHN EDSON BOYNTON, OF CHICAGO, ILLINOIS, ASSIGNOB TO' WESTERN ELECHSBIC- COMPANY, INCORPORATED, 0F NEW YORK, N. Y., A CORPORATION OF NEW YORK.

METHOD or am) MEANS roaHANDLmG MAT-rsa,

Application led lay 8, 1924. Serial No. 711,763.

i This invention relates to a method -of and means for handling matter which is sutiir ciently plastic in one state so that'it myf The primary object of the mventionis to provide a method of and means for effecting ,a continuous extrusion of matter. L

Other objects of the invention are to extrude matter by continuously receiving a supply of it in one state, changing it into,

a different state, and' then causing it to.. p

' the temperature of the cylinders 'varies'from emanate continuously from an aperture at a rate substantially proportional to the rate at which itC is received and to provide an improved method of and improved means for continuously forming pipes and tubing;

i to provide an improved method of and improved means for' continuously sheathing a cable. n

A preferred form of the invention is em- 4 bodied in an extruding machine for sheathwith `respect to' the discharge opening.

ing cable cores and comprising` a plurality of pumps which receive fused metallic matter fromxa common supply thereof and force the fused matter into an annular chamber, the annular chamber havin a discharge opening. A die is adjusta ly supported core tube projecting into the annular chamber and ali ed with the die provides means `by Way o ,which a cable core mayJ pass through the chamber so that matter forced into the annular chamber by the pumps will sheath the vcore, the machine being so designedthat the matter reverts toits solid 'state before it comes into contact with the core.

The core` when it leaves the extruding machine is enclosed in a sheath of the solidified matter. The several pumps are disposed machinefas plungers slidably en ds of the cylinders communicate directlywith the annular chamber. The outer ends of wthe cylinders are free to`move when the cylinders contract or eapand in response to variations in the temperature thereof, or 55,`

when the cylinders movefradially with respect to the axis of the annular chamber during'temperature changes in the extruding 'ouifnaled in the cylinders are recipi'ocatedv mounted` inde ndently of the cylinders.

This construction insures that deformationv` of the cylinders will not be occasioned when by means 60 the temperature of other parts of the ma- 35 pumps. Other valves are provided for pre venting a back flow from t e annular chainadapted to I"n ,control the flow of the fused matter to the ber to the pumps, and the pumps are so driven that fused matter is being -forced' eontinuousl into ,the annular chamber wheneverv e machine is forming a sheath upon a cable core. The annular chamber comprises a cylindrical portion intermediate to form the discharge opening and the other end being flared to receive the dis. charge openings of the pumps. The/cylindrical portion of the annular chamber A its ends, one of the endsJ being contracted 80 permits a li'elativel large quantity of mat- 35 ter to be stored un er pressure in the-chamber and permits the metal or the matter to be solidified at a point relatively remote from the discharge aperture, it being readily understood that the solidified matter can 9 be displaced longitudinally infthecylindri-1 cal portion of the chamber with muchmsle effort than it could be displaced in a chamber having` converging walls. In line with the above constrctioma plurality of means 95 is provided for controlling the temperature of the mattei' as it passes along the cylindrical of the annular `chamber, the means stable to supply heat to or to withdraw from the matter 1.

extruded. These means permit the operator to cause` a change in the state of the matter vat any desired point in the annular chamber.

The pumps are packed by means of the matter being extruded, that is, a portion of the matter is solidified and employed to between t-he plunger and its cylinder.

n Other objects of the invention will become apparent as the detail description progresses, reference being had to the accompanying drawings, wherein Fig. 1 is a central longitudinal section through an extruding machine which embodies the invention; f

Fig. 2 is an' end elevation of the extruding machine looking from the left in Fig. l; Fig. 3 is a section taken on line 3 3 of Fi l; f

Fig. 4 is. an'enlarged central longitudinal section of one of a plurality of pumps which form parts of the extruding machine;

Fig.' 5 is a section taken on line 5 5 of Fi 4, and

ig. 6 is a central longitudinal section through a pump which, if so desired, may be employed in place of the pump shown in Fig. 4.

It is believed thata complete understando ing of the improved method w/ill be procured by a description of the means by which it is performed.

Referring to the drawings. wherein like reference characters designate like partsv throughout the several views, the reference character 10 designates a base plate upon which is mounted the mechanism4 of an extruding machine embodying the invention.

I, The reference character 11 designates gen erally a -head whichis `disposed at one end, of the base plate 10 and is rigidly secured thereto'by ,a plurality of bolts 1 2. The head 11 comprises a tubular block-13, which together with a back plate 14, forms an annular chamber 15, the back plate 14 being rigidly secured to thetubular block 13 by means of a plurality of bolts 16 (Fig. 3f). It will be noted that the annular chamber 15 comprises a. cylindrical portion 17 intermediate its ends, one of the ends being contracted to form a' discharge opening 18, and the other end being flared as at 19. The

` advantage of `this construction willbf explained hereinafter, but for the present it will sufiice to` state that the annular chamber 15 forms a passage for the matter to be extruded, the discharge opening 18 of. the

In one form of formed integral 1,720,759 .l ff.

annular passage having associa-ted there;

with a core tube 20 anda die 21. The die 21 threadedly engages a die holder22 and is provided at its outer ends with 'a plurality of flattened sides 23 adapted to receive, a wrench, which may be used to bring the die into a plurality of adjusted positionswith respect to the core tube 20. The die holder 22 is interposedl between the'tubular block 13 and a clamping plate 24 which may be adjusted by means of a plurality of bo/lts 25 into a position wherein it exerts sufiicient pressure .upon the die holder 22 to ,prevent displacement thereof relative to the discharge opening 18. The clamping plate24 carriesA` means for laterally v adjusting the die holder 22. This means comprises a plurality of Vbolts 26 which engage the perlphery of the die holder and may be used to effect lateral adjustment of the die holder, it being understood that it is necessary to Iiloosen the bolts 25 when such lateral ad- 'ustment of vthe die holder 22 is to be made.

. die 21 t'o be aligned accurately with respect to the discharge opening, and at the same time permits the ope'rator, to control the cross-sectional area of a stream of matter being extruded from` the machine.

The core tube 20 may be adjusted longitudinally of its axis, the core tube being slidably and rotatably 'ournaled in a sleeve 27 ith theback plateVv 14.

he means for adjusting the core tubev longitudinally of its axis comprises a sleeve 28 with which the core tube makes threaded engagement.' The sleeve 28 is Yscrevv threaded into the sleeve 27 and at its rearwardly extending end is'provided with a plurality of flattened surfaces 29 adapted to be engaged by a wrench-which may be employed to bring the sleeve 28 and the core tube 20, as a unit into a plurality of adjusted positions with respect toy the die 21: This construction also permits the core tube 20 to be replaced quickly and easily as'the operator need only Withdraw the sleeve 28 from thesleeve 27, replace the core tube `20 and then return thesleeve 28 to the sleeve cable core 30 which may be drawnv through y the machine by any suitable means (not shown), or which may be drawn through the machine by matter being extruded from the machine. L Since theA die 21 may be brought into a position wherein its axis is coincident matter being forced into the annular chamber-under suiicient pressure to cause *it to be extruded between the core tube and the die.

' This means for supplying the annularchamber with matter to be extruded includes a plurality of pumps 31, each of the pumps 31 comprising a cylinder 32 having a substantially central bore 33. The axes of the several cylinders 32 are disposed parallel to the common axis of the core tube 20, and of the die 21, the bores 33 of the cylinders opening directly intoithe iaredend 19 of the annular chamber 15. As shown in Fig.

the annular chamber lnaled in each of the cylinders 32 is a 3, the axes of the cylinders 32 are substantially equi-distantly spaced from each other andapproximately so from the common axis of the core tube andthe die. Certain combinations of the cylinders are equi-distantly spaced froml each other and from the axis. Therefore, the cylinders of the pumps may be said to be disposed around `the common axis, or may be said to be disposed around Slidably jourthe matter ina fused state so that it may gravitate byy way of the pipe 37 to the manifold 35, and thence to the cylinders 32. A valve 38 disposed in the pipe 37 provldes means whereby the operator may control the flow of fused matter to the cyhnders.

A plurality of valve devices 40 prevent a back flow from the cylinders 32 -lnto the manifold 35, one of the valve devlces 40 being interposed between each of the cylinders 32 and the common manifold 35 (F1g. 4). fEach valve device 40 is disposed 1n the in-take opening of'its associated cylinder 32 and comprises a. valve cage 41 threaded or otherwise tightly and securely fitted lnto the itx-take opening. The valve cage 41 1s provided with a central vaperture 42, through which .the fused matter must pass on its way to the cylinder. Disposed beneath the aperture 42 and retained in substantial alignment therewith is a solid ball 43 manufactured of matter of less specific gravity than that of the fused matter. It is obvious that the ball 43 will tend to float into' a position wherein it closes the aperture 42 whenever the cylinder -holds a quantity of lfused matter. v

Means are alsoprovided for preventing a back How from the annular chamber 15 to the several cylinders Thus each pump 31 is provided with a check valve 44, which comprises, a valve cage 45 seated in the discharge opening of the pump, the valve cage 45 being adapted to retain a ball 46 in the opening. The ball is adapted to engage a valve seat 47 formedin the opening. l From the foregoing detailed description of the pumps, it is apparent that if one of the plungers 34 is reciprocated in its cylinder, there will be an intermittent, flow of fused matter from the receptacle 36 through the Lcylinder,A and thence to the annular chamber 15, the balls 43 and 46 act-ing to control the flow of fused matter to and from the cylinder. Itis also apparent that the forward strokesof the-several 'plungers 3 4 may bef-so timed relative to each other that a continuous flow of fused matter into the annular chamber 15 is obtained. In this embodiment' of the invention the pumps are driven sol as to continuously force fused mat'- ter in the annular chamber l5 during the extruding operation.

-The means for drivlng the-[pumps 31 comy prises a shaft 50 which is adapted to dri\'e two vertically` disposed shafts 51 and 52 through the medium of a plurality of bevel gears 53, the shaft 50 being driven'from any suitable source of power (not shown). The

vertically disposed shafts 51 and 52 are adapted to drive a horizontally disposed shaft 54, the .shaft 54 being -operatvelyeconnected to the vertically' disposed shafts 51 and 52 by means of a lu'rality o'f bevel 'ears 55. The driven sha t 50'and each o the lshafts 5l, 52, and 54 is rotatably journaled into an upright standard 56 rigidly secured Jto the base plate 10 by-a plurality of bolts 57. The standard 56 is securely held in spaced relation with the head 11s. bv means of a plurality of threaded rods 58 which are rigidly secured to the standard by a plurality ofl nuts 59 and to the .head by a plurality'of nuts 60. Each of the several shafts 50, 51, 52. and 54 has rigidly secured to it a plurality of ecoentrics 61, each eccentric 61 being aligned with one'of the pumps 31. Each eccentric 61 is operatively connected to the plunger 34 of 'its associated pump 31 by means of an eccentric rod 62, and an eci centric strap 63. The free end of each ecf centric rod 62 visupivoted upon a wrist pin 64 carried by a cross-head 65, which is rigidly securedto the outer end of theasso-y ciated plunger 34. .The cross-head 65 is journaled in aplurality of guides 66 rigidly secured to the outer end of the cylinder 32 of the pump. The guides are Virtually in tegral with the cylinders so that they remain in perfect alignment at-all 'stages of expansion of the machine in general. The eccentric strap 63 preferably comprisesa cap 67 and is rotatably journaled upon its eccentric by means of a rollerl'bea'ring which consists of a plurality of rollers 68 anda cage 69. The employment ofthe roller bearing between the eccentric and its strap is advantageous in that proper lubrication between the eccentric and the strap is insured,

it being understood that the eccentrics carry comparatively large loads and that they would tend to drive out any lubricating oil or the like which might be introduced be-v tween them and their straps if the roller bearings were not provided. The several eccentrics 61 are so arranged relative to each other that fused matter-is forced continuously into the annular chamber 15 when the ex.-

' truding machine is in operation, the velocity.

. the cylinders 32 are free to move, when the cylinders contract or expand in response to variations in. temperature and are also free to move when the back late 14 -contracts or expands, thus causing t e cylinders to move in andtout radially with respectto the axis of the annular chamberl. As the guides 66 are mounted on the outer ends ofthe cylinders 32 and are not supported by any other means, they arev also free to move when'the'y orl their respective cylinders move in response to variations in temperature. Thisy construction is provided to prevent deformation of the cylinders 32 and distortion of the guides 66 when the temperature of the head .11 and the-(mechanism associated directly therewith/varies from the temperature of the'stan'dard 56 and the driving mechanism mountedethereon.

Means is provided for packing each of. the pumps 31,' the means in each instance comprismg'a pocket or annular recess 70 (Fig. 4,) turned in a collar 71 which is threaded into an enlargement of the bore 33 of the pum and ma be considered a portion of the cy inder tliereof. The annular recess 70 is adapted to collect and retain any fused 'matter seeking to escape through the clearance which must be provided between each plung` The matter so "collected tendsto revert to its solid state, but to insure such a change of state, an annular chamber 72 `is provided in the collar 71 into which a cooling fluid may be introduced by means comprising a pluer and the wall'ofits associated' cylinder. `85

rality of nozzles 73 having central passages,`

which connect the chamber 72 (Fig. 5). It

is readily understoodthat flexible hose or the y like (not shown) may be fitted over the nozzles 73 to connect the nozzles withv anysuitable supply of cooling fluid, and that means (not shown) may be 'ovidedfor causing forced circulation of# the cooling fluid through lthe annular chamber 72. Cooling yfluid so introduced into the annular chamber 72 will lower the temperature .of any fused back plate 14 to prevent displacement of the pump relativel to the eccentric'and also thel manifold. .The arrangement is such that the pressure which' obtains in the annular chamber 15 Itends to force the frusto-conical head against its seat, 'and as this construction permits the heads to` be ground into the seats, it is obvious that a perfect seal will results in each instance, thus making it unnecessary to pack the heads Referring now to Fig. 1 the tubular bloc 11 is provided with a plurality of annular channels77 to accommodate 5a plurality of coils 78 adapted to{receive cooling or heating fluids whereby the temperature of the mat-` ter passing throu l1 the block maybe controlled. By regu ating the temperature of the fluid introduced into the'coils 78, it is possible 'to solidify the fused matter at any desired point in the annular chamberv 15. Thus the coils 78 associated with'theflared end 19 of the annular chamber 15 could be supplied with a heating fluid to prevent solidification of the fused matter, and the remaining coils could be provided with a cooling fluid of propeftemperature tocause the fused matter to revert to its solid state as it enters Ythe c lindrical portion 17. A sufficient su ply` ofya matter inits solid state would then e stored in the annular chamber to negative the possibilit extrusion aperture. Comparatively little power is required to move the'solid matter that any mattei" night pass out in its fuse state through thel along the cylindrical ortioii 17 because this portion of the cham cross-section.

r 15 has aconstant I.

reciprocate in the bore 83 car-ries means at its forward end for holding or'retaining a quantityof the matter which is being extruded. The means preferably comprises a I plurality of annular grooves 85 in which the matterv may collect and solidify, vthe solidified matter-being then heldin a osition wherein it packs the cylinder. .O course the pump is so designed that a comparatively low temperaturewill obtain in the extension 81 as. compared with-the temperature -obtainingin the cylinder 80, and the plunger 84 is not brought'into a position wherein the fused met'alpassing from the intake opening of the pump to the discharge opening thereof may fuse the matter solidified upon the forward end of'the plunger. In Fig. 6 the plunger 84 is provided vith "a cross-head 86 slidably journaled in guides 87- rigidly secured to' the cylinder 80. The guides 87 are so arranged that air may circulate about the extension 81 to keep it at a temperature `below the temperature of .the

In the operation of the device a supply of the matter to be extruded is fused in the receptacle 36 and one end of the cable core 30 is threaded Ithrouglf'tlie core tube 20- and the die 21, one end of thecore being introduced into the core ltube 20 by way of the sleeve 28. The valve 38 is then opened and the extruding machine set in operation. The fused matter flows to the several pumps 31 by way of the pipe 37 and the manifold 35, and the pumps force thev fused matter into the flared end 19 of the annular chamber 15. The matter Vsolidiies as it passes through the cylindrical portion 17 of the an nular chamber and is formed by the core tube and the die into a sheath which encloses the cable core being drawn through the machine.

This process is continuous as the receptacle 36 may be charged from time to time so that the pumpscan continue indefinitely to force fused ma'tterffin the -annular` chamber 15.

The length of the core and not the size of the receptacle 36 would in a manner determine the capacity-of the extruding machine.

What is claimed is: f 1. method of extrusion, which'consists in continuously transformin fused matter into a hollow article of so idified' matter vhaving awall of uniform thicknessv throughout its length, and then continuously forcing the solidified matter through an extrug the solidified mattei' remote from the extru- V sion aperture.

2. A method of extrusion, ywhich consists in continuousl transforming fused matterinto a t-'ube o solidified matter, having a wall of uniform. thickness throughout its length, and simultaneouslyy reducing the diameter of the tube and the thickness '0f the wall thereof by supplying additional fused matter under pressure at a point on the solidified matter remote .from the extrusion\ aperture? 3. A method of extruding a sheath for a core, which consists in continuously transforming fused matter into a tube, having 'a wall of uniform thickness of solidified ing an extruding aperture, solidifyingcthe,

matter therein, and continuouslyforcing the solidified matter through thel aperture by the introduction of fused matter into 'the phamber in `cfontact with the solidified mater. f) l 5. A method of extrusion, which consists in pumping fused matter from a plurality of pointsv in continuously recurring cycles into a common chamberhaving an extruding aperture,solidifying the matter in the chamber, and continuously forcing the so.- lidified matter through the aperture bythe introduction of fused matter into the chamber in contact with the solidified matter.

6. A method of continuously extruding matter, which consistsin introducing fused matter into a chamber having the same cross section for the greater part of its length, allowing said matterto solidify, and reducing the cross-section of the solidified matter through said chamber due to the force exerted by the continuous introduction of additional fused matter. p

7. A 'method-of continuousl extruding matter, which consists in intro ucing fused matter' into a chamber at a plurality of spaced points, allowing said matterfto solidify, and forcing the sollditied matter` through said chamber by simultaneously forcing a plurality of independent ortions of fused ^matter directly intotthe c` amber.

8. A method vofYcont-inuousl extruding matter, which conslsts in intro ucing fused ioo matter into a chamber ata plurality o'f spaced points, allowing said matter to solidify, and forcing the solidifiedmatter through said chamber by simultaneously forcing a plurality of portions of fused matter into yin supplying matter under pressure to a chamber-having an extrusion aperture, so-

lidifying the matter therein into a plurality of separated portions, extruding one of the solidified portions through the aperture and utilizing another solidified portion for pre- Venting leakage of the fused matter from the chamber.

p 10. A method of extrusion, which consists Iin-supplying matter under pressure to a lidifying a portion of t-he matter, extruding.

'the-solidified portion through the aperture,I collectinganother. portion of the fused matter in a pocket adjacent another opening in the chamber, and solidifyingl the collected matter to prevent leakage of the fused matter through the opening.

l1. In an extruding machine, a chamber having ank extrusion aperture and a plurality of pumps disposed tcompletely around the chamber for continuously supplying the )chamber with fused matter, each pump beingpositioned to discharge directly into the chamber in a direction-substantially parallel to `the direction in which the matter passes through the aperture of the chamber. i 12. In an extruding machine, an annular substantially cylindrical chamber, means for continuously supplying thehamber with matter being extruded and comprising a plurality of cylinders communicating directly ^with the chamber and having their axes disposed substantially parallel to the axis yof th e chamber, a` plunger for each cylinder, and means for lreciprocating the plungers. to introduce fused matter into said chamber and force the ter therethrough.

,13. In an extruding machine, an annular chamber having an aperture for shaping the extruded matter',` means for continuously sup lying the chamber with matter being exed, and comprising apluralitgUQf-cylinders having .their `axes disposed parallel of the chamber, the cylinders tially equidistantlyA spaced Afrom eachn ot er and from thjje axis ofr the Vchamber,l a plungerfor each cylinder) and means forre'ciproating the plu'ngers.l ,f t .14. In an extruding` machine, a housing, a chamber therein, means".o for continuously supplying the chamber with matter to be -end srude'd 'and comprising cylinders project- .ing from the ho.using,a portion of each cylino gd'er being? free to move when the housing 'lexpands'and contractsya piston disposed in `each cylinder, and means the piston to introduce fused matter into said *'65 chamberl and force the previously admitted matter therethrough.- ,Y

chamber having. an extrusion aperture, so-

lpreviously admitted mat- 'l chamber having a cylindrical portion interfor reciprocating.

15. In an extruding machine, a housing having a chamber therein, `means for-continuously supplying the chamber with matter to be extruded and comprising cylinders 'projecting from the housing, a portion of each cylinder being free to move when each cylinder, expands vor contracts, a piston for each cylinder and means independently supported With respect to each cylinder for reciprocating the piston.

16. In an extruding machine, an annular chamber having a cylindrical portion of` constant cross-section intermediateits ends, one portion of the annular chamber being contracted to form a discharge opening, and means for continuously supplying the chamber with matter to be extruded.

17. In an extruding machine, an annular chamber having a cylindrical portion of constant cross-section intermediate its, ends, one of the ends being contracted to form a discharge opening and the other end being flared, and a plurality of pumps communieating with the flared end for ,supplying the chamber With matter to beextruded.

18. In an extruding machine, a chamber having one portion thereof of constant cross' sectionand a plurality of means communicating directly With one end of the chamber for continuously supplying it with matter to be extruded.

'19. In an extruding machine, an annular chamber having a cylindrical portion intermediate its ends, one of the ends being contracted to form a discharge opening and the other end being flared, a plurality of pumps communicating directly with the flared end for continuously forcing matter to be extruded into the chamber, and a valve for each pump for preventing a back flow from the chamber into the pump. g 20. In an extruding machine, an annular )a plunger for each cylinde'", and means for reciprocating the plung'el's. A 21. In an extruding machine, an annular chamber havin a cylindrical portion intermediate its en s, one ofthe ends 'beingcontracted to for@I a discharge openignd the other end beingv flared, the length of the .cylindrical portion being greater'than that of the contracted portion, and means com- 'nunicating directly with the flared end for ycontinuously supplyingthe chamber 'with matter to be extrude 22. In'an extruding machine, an annular 4. Mluder-for reciprocating the tinuously supplying the chamber with matter to be extruded.v

23. In` an extruding machine, an annular chamber having a cylindrical portion inter; mediate its ends, one of the ends being lcontracted to form a discharge opening and the y,otlier'end being flared, and means for continuously supplying the chamber with matter to be extruded and comprising a plurality yof cylinders opening directly into'the iiared.

end of the chamber, a plunger for each cylinder, means pivotally connected to the plungers for reciprocating the plungers, and means for supporting the' last-mentioned means independently of'thecylinders.

v24:. In an extruding machine, a housing having a chamber therein, the chamber hav- 25f`in` a cylindrical portion intermediate its ,engtone of the ends being contractedto forma dischar eo ening and the other of the ends beingV are and means for continuously suppl `the chamber with matter to ,be extruded' and comprising cylinders 'project'. from the housing an communieating with the flared end of the chamber, the outer end of each cylinder being free to move whenfeach cylinder expands or contracts, a plunger for 'each cylinder, and meansgsupported independentl of each cylunger.

an extruding machine, a housing a chamber therein,the chamber hav- -40 insa cylindricalportion intermediate its ,l one of the ends being contracted to Y forma discharge 'opening and the other lof the ends being flared, and eans for conftinuously supplying the chanlilier'with matrter to be extruded and comprising cylinders jprojecting from the housing and communieatingJ wit-h the flaredl end of the. chamber, the outer end ,of each c liider being free to move when each `cylin er expands or contracts, a plungerA for each cylinder, and means pivotally connected to the plunger and supported independently 1of each 'cyliider for reciprocating the plunger.

, 26; In lan extruding machine, a chamber inclu a plurality of pumps disposed complete y around the chamber for continuhavindglfnn )extrusion aperture, and means ously supplying the chamber with matter- K- and extrudingY said matter therefrom, each pump' comprising an intake passage convnectedwvith a supply of said matter, a valve seat in'the passage', yand a valve' member of( less Weightthanan equal volume of said matter and designed' to 4float thereon into `a position wherein it engagesthe valve seat to close the passage. Y. 27. In an extruding machine, a chamber, a yplurality of pumps disposed around the chamber and communicating therewith, and a common manifold for supplying the pumps with matter to be extruded. Y

` 28. In an'extrudingvmachine, a cliamber, a plurality of pumps disposed around the chamber and communicating therewith, a

common maniiold for supplying the pumps 7 with matter to be extruded, and a pluralityv of check valves associated with .the manifold for preventing a back flow into the manifold from the pumps.

29. In anf extruding machine, an annular chamber, a plurality of cylinders .disposed around the axis "of the chamber and substantially parallel therewith, each cylinder communicating directly with the annular chamber, a plunger in each cylinder, means lfor reciprocating the plungers, a common manifold for supplying the cylinders with matter to be extruded, and a check valve foreach cylinder for preventing a back flow into the cylinder from the chamber.

30. In an extruding machine, anrannular)v chamber, a plurality of lcylinders disposed around thevaxis of the chamber and substanv tially parallel therewith, each cylinder communicating directly wiith the annular chamber, a plunger iii each cylinder, means for reciprocating the plungers, a common manifold for supplying the cylinders with matter v to beextruded, means for preventing a back flow from the cylinders into the manifold, and means for preventing aback flow from the chamber into the cylinders.

. 31.- A method of continuously extruding E matter, which consists in forcing fused matter into a chamber, causing the solidifica- 1 05 tion of said matterby (surrounding said p chamber on opposite sides with a cooling medium; andforcing said solidified matter through an extruding aperture to reduce its cross section due to the introduction of fused matter. 4 Y s 32. A method of continuously extruding matter, which consists in forcingfused matter into a chamber, causing said matter to solidify, and forcing said solidified matter through\the chamber dueto the'introdl'iction of additional fused matter therein in a. direction substantially parallel to the direction of its movement through said chamber to reduce its cross-section. y 120 33. A method of continuousl" i-extx'udin matter, Whiclgconsi'stsv in intro' using-fuse matter into a chamber, allowing said matter to solidify therein, and forcin'g'the solidified matten through the chamber solely by "the subsequent introduction of fused matter to effect a reduction in the cross-section of the solidified matter. l

34. In an eztruding machine, a die,l a chamber associated wlth said die, and means for forcing fused matter into said chamberl y Where itsolidies and is thereafter forced l 5 through said die due to the introduction of an additional/quantity ofvfused matter.v

i 35. In an extruding machine, a die, a core -tube associated with saidtdie, a chambersur- -rounding said coretube, and means for forc- 

